Little known fact: Abraham Lincoln was a very good math student! In this video I share the story of why he studied Euclid's Elements. I also share a problem he did while in school. He did in fact get the correct answer, and we can deduce the steps he took from the somewhat mysterious calculations in his manuscript.

My blog post for this video:
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Presidents' Day Special. Math Homework of George Washington And Abraham Lincoln:
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Sources and further reading
Henry Ketcham, The Life of Abraham Lincoln, at Project Gutenberg.
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Harvard University - Hougton Library / Lincoln, Abraham, 1809-1865. Exercise book fragment: manuscript, [ca. 1825]. MS Am 1326. Houghton Library, Harvard University, Cambridge, Mass.
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My Books
"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 3.8/5 stars on 31 reviews)
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"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 4.6/5 stars on 3 reviews)
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"Math Puzzles Volume 1" features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.4/5 stars on 13 reviews.
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"Math Puzzles Volume 2" is a sequel book with more great problems. (rated 4.3/5 stars on 4 reviews)
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"Math Puzzles Volume 3" is the third in the series. (rated 3.8/5 stars on 5 reviews)
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"40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4.3/5 stars on 12 reviews)
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"The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 4 reviews)
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"Multiply Numbers By Drawing Lines" This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5/5 stars on 3 reviews)
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